Ricinoleic acid is a strong PTGDS inhibitor. It was one of the 5 strongest plant constituents that inhibits PTGDS between 389 constituents studied. Another big plus for it! It's not only an exogenous PGE2 agonist but it also must lower PGD2. Great!

That study claims Swisstemple theory and some other guys stories who had succes with castor oil. Now how about the rest? For example capers are very high in quercetin 3-O-rutinozide, do you think caper juice as topical could work?

http://phenol-explorer.eu/contents/polyphenol/296

Or for example Styphnolobium japonicum - the plant from the rutin is derived - extreme rutin content.

I know we could just put pure rutin or ricinoleic acid on head, however i've always thought that there's some special synergy in components of whole plants..